Process for the manufacture of continuous sheets or corrugated plates of asbestos cement with insertion or insertions of iron wire netting



June 28, A R NTSEN PROCESS FOR THE MANUFACTURE OF CONTINUOUS SHEETS OR CORRUGATED PLATES OF ASBESTOS CEMENT WITH INSERTION OR INSERTIONS OF IRON WIRE NETTING Filed Aug. 14, 1929 27 1| 1| u n 1| n K I I0 j. 1

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/0 M 8% a as nventor Qfforney 10 of zinc-oxide and of the largeered by. the asbestos cement mixture Patented June 28, 19392 p UNITED STATES PATENT orncs ABIE HEBMANUS AB mi'TSE-N, OF NETHERLANDS PROCESS FOR THE IANUFLCTUBE OF COmUOUS SHEETS OB CORRUGATED PLATES ASBESTOS CEMENT WITH INSERT-ION OB INSE'BTIOHS 0! IRON WIRE NET'IING Application filed August 14, 1929, Serial No. 885,980,;nd in thus obtained are freed from liquid substances by pressure and. are then dried.

This process, however, has not proved a success in practice, because the composition of'the mixture is, in consequence of the use quantity of asbestos much too expensive and also because the application of the mixture to the inserted material is difiicult and very slow. Moreover it is very often the case t at the inserted material rises to the surface of the thin mixture and is consequently not properly covat the same time the addition of tlie mass to the inserted reinforcement is very imper- 2 feet. These are some ofthe causes why this process is not in practical use Finally it mustbe pointed out that the so-called circular sieve and joggling machines which are employed for the-manufacture of the usual asbestos cement plates or sheets without insertions .are absolutely unsuitable for the manufacture of such sheets or plates withiron wire insertions.

=According1to the present invention which eliminates t e above mentioned defects the cement and asbestos are mixed together with wate in certain proportions with or without an admixture of colouring matter to a thick paste, which paste is applied to both sides of an iron wire netting or gauze. The netting or gauze is then passed centrally-between one or more airs of rollers arranged in sequence where y the paste is Ipr through and around the meshes of t e wire nettingrby means of rollers spaced at a distance om one another, the excess water being then removed by means of one or more pairs of rollers, whereu on the continuous sheet of asbestos cement wrolled or pressed 'oiitto'the desiredthickness. Afterthe termior web nation of this process further layers of iron wire netting maybe applied to both sides of the asbestos cement sheet as previously manufactured, these new layers of netting being again embedded in asbestos cement, whereupon the excess water is removed by pressing. The process may if required be repeated several times. Finally before the asbestos cement sheet is quite dry it may be passed between pairs of-corrugated or fluted .rollers, arranged in point form, in such a manner that in the first instance two corrugations are formed in the middle of the sheet whereupon further corrugations are rolled on either side of the middle into the asbestos cement sheet which has in the meanh l t time been cut oif,=so that the plate or sheet is progressively corrugated hroughout the whole width.

The asbestos cement sheet containing an iron .netting insertion or insertions is thus manufactured in a continuous endless band, which can be cut into sheets of anydesired length.

according to t e'invention more clear y, reference is made to the attached drawing in which Fig. 1 is a diagrammatic view showing the operationsfor the manufacture of continuous asbestos cement sheet with a reinforcing iron wire netting insertion or insertions and Figs. 2 and 3 schematically illustrate the manufacturing process for corn-- gated plates or sheets.

The process consists in mixing together For the pur ose of explaining the rocess V the Netherlands and. Germany May 16, 1989.

cement and asbestos, preferably asbestos of 7 short fibres in a proportion say 7 :1 with sufiicient water to make a thick-paste. If it is desired to produce coloured sheets or plates then the desired colouring matter is worked into. and thoroughly mixed with this paste. This asbestos cement plate, which 4 contains comparatively little water is then of iron netting 2, this-iron wire neted to both sides of a continuous band ting sheet is passed in its vertical pofition smoothly and centrally between two or more pairs of rolls 1 arranged one behind the other, the rolls being arranged at same distance from one another. The rolls 1 are provided with vertically projecting ed es whilst the surfaces of the rolls are prefera ly made of metal gauze, for the purpose of enabling the 'water to escape through the meshes of this gauze surface. The asbestos cement mass 3 is pressed by means of the rolls between; through and around the meshes of the iron wire netting'2 and it consequently encloses the meshes completely. A second pairof 16 rolls 4, which is preferably designed and constructed similarly to the pair of rolls 1 forces the excess water out of the mass and at the same time rolls the continuous asbestos cement sheet to the desired thickness. If it is required, several pairs of rollers 4 may be provided.

If it is desired to manufacture continuous asbestos cement sheets with several insertions of ironwire netting, the iron wire netting bands 5 are applied again to both sides of the asbestos cement band or sheet 7 already produced and these new insertions are again coated with asbestos cement paste 6. T e continuous asbestos cement sheet 7 originally manufactured together with the iron wire netting sheets 5 ap lied to both its sides with their respective as then passed between one or more pairs of rollers 8.

- For the purpose of forcing the water out of the outer coatings and also for the purpose best of rolling the continuous sheet 9 to the desired thickness it is passed through one or more further pairs of'rolls. o If this process is continued further continuous asbestos cement sheets with any desired number of reinforcing wire insertions can be produced, and they may be, according to the invention, whether the paste 1 was mixed with colouring matter or not, either all of one colour. or of one colour on one side and of another colour on the other side, or they mgy be leftin their natural colour.

f corrugated platesare required then the continuous asbestos sheet 9 is before it is quite dry'passedbetween pairs offluted rolls 10 arranged in ointed form, in such a manner, that in the st instance two corrugations are rolled into the middle of the continuous sheet, and thereafter other corrugations are rolled into the continuous sheet on either side of the previously form'ed corrugations and so on until the sheet is corrugated throughout its 'whole width. Finally the corrugated plates or sheets may be passed through between one or more pairs of fluted rolls so as to accentuate the shape of the cor-.

tions.

en the continuous sheet 9 is clamped or g, held by the first pair of rolls 10 it is out of a to the desired length. a

such cases where the.

estos coatings 6 are netting and to remove the excess water, rollredness The continuous asbestos cement sheet or the corrugated asbestos cement plates may after they-have been scored be bent to any angle, while after the score has been filled the thickness of the sheet or plate remains the same as it was before. The corrugations ormed in the plate remain in it even after it has been cut off, as the wire netting acquires the corrugated shape imparted to the plate. 4

'As the process according to the invention is a continuous one the manufacture proceeds rapidly, and consequently the manufacturing costs are low, while the plastic mass remains in a good condition because of its quick application. The lateral edges of the continuous sheet stand accurately at ri ht angles'to the plane of the sheet. The s eet has therefore no water edges asin the case with the hitherto known asbestos cement plates or wire insertion. The two sides ofthe sheet are perfectly smooth, as the mass is moulded by means of rolls and as no felt bedding is used in the manufact process.

It is self-evident that the asbestos cement plates or sheets with iron wirenettin can e used for numerous purposes especi y in usual asbestos cement plates without any wire reinforcement are useless because they do not possess sufiicient carrying capacity or tensile strength.

I claim as my invention:

1. A process for themanufacture of continuous sheets and corrugated plates of asos cement with the remforcement of iron wire netting, consisting in the mixing of cement and asbestos in a certain proportion together with water and'coloring matter to a thick paste, applying this paste to both sides of an iron wire .netting, pressing the paste and netting a plurality of times bywater permeable means to force the paste against, through and around the meshes of the iron 0 ing' the sheet to the desired thickness, the sheet to nearli complete dryness, corrugating the sheets first rolling two corrugations into the middle of the sheet and then other corrugations on either side of the mid- I16 dle of the asbestos cement sheet in such a manner that the plate is corrugated progressively throughout its whole width, and cutting the sheets into desired'lengths.

2. A process for-the manufacture of continuous sheets and corrugated plates of asv stos cement with the reinforcement of iron wire nettin consisting in the mixing of oement and as 0s in a certainproportion together with water and coloring matter to a thick. aste, applying this paste to both sides of .an iron wire netting, pressing the paste 7 and netting a pluraity of times by m permeable means to orce the paste against, through and around the meshes of the iron 15 netting and to remove the excess water, applying more iron wire netting to both sides of the previously manufactured continuous asbestos cement sheet, applying asbestos ce- 5 ment to said netting as before, pressing said cement to remove excess water, rollin the sheet of asbestos cement to the desired t ickness, drying the sheet to nearly complete dry-- ness, corrugating the sheet b first'rolling two corrugations into the mid le of the sheet and then other corrugations on either side of the middle of the asbestos cement sheet in such a manner that the plate is corrugated progressively throughout its whole width, and cutting oif the sheets to desired lengths.

ARIE HERMANUS ARENTSEN. 

